ARIS Architect & Designer 9.8: Grey and empty connections

On several PCs we have the same problem: Opening a registered System Reference Model with the Explorer gives a view with correct information on the left side, but empty and grey boxes on the right side. These boxes are connected to objects in the Organization part, but the connections somehow are not visible or active.

This has been a problem on a colleague's PC, but it worked fine on mine. But after upgrading my PC from Windows 7 to 10 I got the problem also. Installing the Aris program on a third PC with Windows 7 did not help either.

Now we have three PCs with the problem, and not any without it. So we are stuck!